11. Name the triangles that are classified by sides.

right, scalene, isosceles
scalene, isosceles, equilateral***
acute, right, obtuse
obtuse, isosceles, acute

It is, in fact, A

a rectangle can be long and skinny, 4 sides not equal.

and we have a winner!

Lol thanks!! :-)

is it A?

Ooooohhhh. Thanks alot.

Bzzt. no two sides of a trapezoid have to be equal. Think harder.

To determine the names of triangles classified by sides, you need to understand the definitions of these terms:

1. Scalene triangle: A scalene triangle is a triangle in which all three sides have different lengths.

2. Isosceles triangle: An isosceles triangle is a triangle in which two sides have the same length, while the third side has a different length.

3. Equilateral triangle: An equilateral triangle is a triangle in which all three sides have the same length.

Now, let's look at the given options:

1. Right, scalene, isosceles: This option includes a right triangle (classification by angle measures) along with scalene and isosceles triangles (classification by side lengths). However, it does not include the classification of an equilateral triangle.

2. Scalene, isosceles, equilateral: This option includes scalene, isosceles, and equilateral triangles, covering all possible classifications by side lengths. Hence, this is the correct answer.

3. Acute, right, obtuse: This option refers to the classification of triangles based on angle measures rather than side lengths. It includes acute, right, and obtuse triangles but does not address the side lengths.

4. Obtuse, isosceles, acute: Similar to the previous option, this refers to the classification of triangles based on angle measures. It includes obtuse, isosceles, and acute triangles but does not provide any information about the side lengths.

Therefore, the answer is "scalene, isosceles, equilateral."

Name the quadrilaterals that have four equal sides.

rhombus, square
square, rectangle
parallelogram, rhombus
rhombus, trapezoid***

is this right?

nah. I think B.